Android 9

Download the Samsung firmware for the Galaxy S9+ SM-G965F with product
code PRT from Poland (Play). This firmware
has
version number PDA G965FXXU5CSF2 and CSC
G965FPRT5CSF2.
The operating system of this firmware
is Android 9 , with build date Tue, 04 Jun 2019 05:23:29 +0000.
Security patch date is 2019-06-01, with
changelist 16162958.

Once in download mode, connect your phone to the PC, preferably using the original USB cable you got with your phone. Odin should detect your device and a BLUE box will show up with the COM port number. (Be sure, the SAMSUNG-drivers are installed on your PC!)

Do NOT tick any extra boxes. The only options to be ticked are F.Reset Time and Auto-Reboot.

Click the start button, wait for Odin to say 'PASS' in a GREEN box. Once the flash is complete, your phone will reboot, and you can disconnect your phone from the PC.

Once in download mode, connect your phone to the PC, preferably using the original USB cable you got with your phone. Odin should detect your device and a BLUE box will show up with the COM port number. (Be sure, the SAMSUNG-drivers are installed on your PC!)

Do NOT tick any extra boxes. The only options to be ticked are F.Reset Time and Auto-Reboot.

Click the start button, wait for Odin to say 'PASS' in a GREEN box. Once the flash is complete, your phone will reboot, and you can disconnect your phone from the PC.